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https://github.com/lilyminium/improper_orders

Which atom is central in your improper torsion?
https://github.com/lilyminium/improper_orders

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Which atom is central in your improper torsion?

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# Which atom is central in your improper torsion?

The central atom is indexed from 1, i.e. 3 indicates the third atom.

| Package | Improper type | Central atom | Links and notes |
|------------|---------------------|--------------|------------------------------------------------------------------------------------------------------------------------------------------------------------|
| AMBER | Periodic | 3 (or 2) | Torsions can be reversed for 1-4 torsions. https://github.com/MDAnalysis/mdanalysis/issues/2386 https://github.com/openmm/openmm/issues/220#issue-22877306 |
| ParmEd | Periodic | 3 | https://github.com/MDAnalysis/mdanalysis/issues/2386 |
| ParmEd | Harmonic | 1 | https://github.com/MDAnalysis/mdanalysis/issues/2386 |
| Gromacs | Periodic | 1 | https://github.com/MDAnalysis/mdanalysis/issues/2386 |
| Gromacs | Harmonic | 1 | https://github.com/MDAnalysis/mdanalysis/issues/2386 |
| OpenFF | Smirnoff (periodic) | 2 | https://github.com/openforcefield/openff-toolkit/issues/746#issuecomment-710574144 |
| OpenFF | Amber | 3 | https://github.com/openforcefield/openff-toolkit/issues/746#issuecomment-710574144 |
| CHARMM | all? | 1 | https://github.com/michellab/Sire/issues/193#issue-303038454 |
| MDAnalysis | all | any | MDAnalysis does not check connectivity. (However, calculating values of improper torsions assumes the central atom is first.) |
| NAMD | all? | 1 | Follows CHARMM |
| OpenMM | all | 1 | http://docs.openmm.org/7.2.0/userguide/application.html#periodictorsionforce |